RFC 2326 Deep Dive: How RTSP Interleaved TCP Framing Works
Understand the binary dollar-sign ($) framing protocol that allows RTP and RTCP to multiplex over a single TCP socket.
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#1Interleaved Packet Structure
When interleaved over TCP, each RTP packet starts with a 4-byte header:
1. Byte 0: Magic character ASCII $ (0x24)
2. Byte 1: Channel number (0 for video RTP, 1 for video RTCP)
3. Bytes 2-3: 16-bit big-endian payload length
4. Followed by raw RTP payload bytes.
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